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Heat and Mass Transfer

Heat and Mass Transfer
Heat is closely related with

Liquids
Temperature
Entropy
Energy

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Heat and Mass Transfer
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

0.16736111111111
0.084027777777778
0.043055555555556
0.042361111111111

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Heat and Mass Transfer
The amount of radiation mainly depends on

Temperature of body
Nature of body
Type of surface of body
All of these

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Heat and Mass Transfer
Sensible heat is the heat required to

Convert water into steam and superheat it
Increase the temperature of a liquid of vapour
Change vapour into liquid
Change liquid into vapour

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Heat and Mass Transfer
According to Stefan's law, the total radiation from a black body per second per unit area is proportional to

Absolute temperature
T2
T5
T

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Heat and Mass Transfer
Thermal conductivity of water at 20°C is of the order of

0.42
0.23
0.51
0.1

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MORE MCQ ON Heat and Mass Transfer

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